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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9ebbb87eda9041e30980c7d0fe7bd323ad04c2876833b14c6ffb5fa0599025' 
  AND token = 'z324Hx5vrD8nW81VB7/jsahJNNYGAVfoj3LzhuKyD2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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