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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38fbbaad2abeea098e6afe37bd4e3ac8246aa3ef48a044b6fbd1e78d684a1bf' 
  AND token = 'Qj2h4bdtVfXbPIdl+RMFTNLF/w55KHQQCnvRm75sRGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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