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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86285e759e38e2be748475dbbfc30c96b83acb3bda7f851d34a9750d422ce885' 
  AND token = 'DrdT401QfDmxXlCSGA+u/JlrheZgKR7vycHej9bFEtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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