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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774e4d809fb824c86b589d6509cf9f0fbc212fedf4de99cc19ac952dcf435831' 
  AND token = 'x/x5m02DExM5jrYfZ6gdGZBKGocF4tXx21KeVVVRBmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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