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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabb413508ab0f3c41931a8ab2b8b8ef2f2bbf4ba64ba3459f419c9adf2e637e' 
  AND token = 'IFC1JDL/hx2aRjehsv43Rc24nojXMVuvKduKmYMn1Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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