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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce674e58d5e03b9066b109f0698a1a0280507c4885028410eedd69efe1825c3c' 
  AND token = 'iin9m/ar/tWMy4ohqtKA6bXGM5RpOnTgk/eKz/IIvTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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