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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756fc44b57ef75a9b9f3704d53a574c3f8bd66cfeb617d86438fefa4d38fdafa' 
  AND token = '3SJN3YRclAJrHoidMkaue4l+HDHNzXZ9/SEvFXL4vzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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