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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd378e046a46a791f8e1b2a0663239bea4f70098a9640bb74879db502ed907884' 
  AND token = 'OLF+2Xh06TMZsE90JHfe0YO3lmCtqhIRIyjRg4/5FC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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