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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e50562648942c7ecad5d3e1f615d90e95fbbaac35514a3f1bf4969e34ee0ea' 
  AND token = 'FEPh+vP9BaE2X2XveRURNb71K8X706C0gQIvBMmbJMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}