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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c69357aa689c0e16d81954875dd7d887c4abc12c8b214976a41a67974b8469' 
  AND token = 'xlBtFwPK7P4Vh9uzQkjPv/AA7tuxGeX7kgDk3aRbtos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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