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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58caa1f6b79bf5b3a4ba5d8ce017b07144d907e9e30bccebb7bc5ff3bbb0444' 
  AND token = 'GDHadFZiYLZiUofPbSopzSyJQdF+FiZtrP80wju0Lto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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