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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9372957e0b0f93b2e505f9139543bd724cc69abcfa94cc602216c817e610af08' 
  AND token = 'q9/XJb4cwWMTLebnqyChSbqTtVivpIiCu9C1v1jianM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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