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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe56267d1b7ad94313cc186e3214da6119225d899179f797eae339e92490384' 
  AND token = '+dWUHOyj1vWu9fO/HFmQ8gY+rEt5+W6vxVAZ++vjHco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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