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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec12f7d0b4ec17bf19b589e844ef7fa2b427d7ab1f6e2f432f5ce294b0892306' 
  AND token = 'SEgguIVj5DoW7k63LYXQ468wwj1Jr1HzwQ1YKBN+II8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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