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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e82b4ccd9e6882911af6351d823ede28d1a3343194c3903361de36a27b6c63' 
  AND token = 'OetHGZ7Is96expMJiDEPKdYXjQLOkx5MBzXaJuJKrLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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