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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dea27c786c8948ea60697ae0ea6032697c7ebe9613e5989119686f91b8921d8' 
  AND token = 'bjisTQXPw9nN6W1Kw+VMJwhpZ7fxcFTp+oY4gg7jTvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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