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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e7c2b5c864c42c83f4d6f3354090e99cc47a2fe2596ca5b3fb245d722c02ee' 
  AND token = 'SU8ImYAMU4F7oV7DLnt7OzzvKGNVoa62K7WGJgcX+gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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