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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a882e623844939ef3b1c3fbad8729c5a304d9cb3aca2173085899b05e9bff0' 
  AND token = 'uZPMMiWXEER13dsRAFlMd7uBFl2B8SZOMhf6Nl0cg9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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