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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1eb1f3f78ea265bd855ea9c77dc64cb8388dc0d85df3f7a2660f221f8975bbe' 
  AND token = 'dIgJUdb0L/hyKP1MGkUuVACe7KVV/sdW3lwMKrMH0gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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