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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc330c212a59bf61fd261dc8947f19e2c3def4f1ad315163d2783330d116cf93' 
  AND token = 'EmpeyRrhyS4df7V8Uy0fC921U2PlrNNYZ16uXz2YkWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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