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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f9ceea630a2ea9cbfc84bb595f1518a57235b56a2116f258c15fb0b6aabed3' 
  AND token = 'wiNFmjAR8mKc7UPJZOStBd5OcCOF6tKUmrsf//zL2yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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