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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ea55af739381620edab58c037d354a2628c64dea4883005474e6c4b4ee1814' 
  AND token = '0r4bulq61NRS8mHbTH0eRKWAxTWfuDheMB2yp9gQuf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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