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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f85085aaf61604a0b3eff28656f5b2d2284233586b9bc2cd91a4a4e411e60d9' 
  AND token = 'HWNTknGSl1uD5tzgCfQhCkp/IRM4lfIIrQ9sFkYK5Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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