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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa69aabc0c00ea90bc56ca4aa99cc30453d38cbe7add9981ed5a6260ad96dcc' 
  AND token = 'wNZ38DlEG41ufhgcpdt3qIlaUDb1VO5vhabDFHvaDUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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