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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da06567f2b4dee66094dfc63f2ba739122f0b62c45fa710e0fef8123d5b185e' 
  AND token = 'pnkRA0JK8Q6N5TYn2MD7DenhrjqaXo70Sxsdiyax1CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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