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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fce730c945eba5e5b980cd7d6f9517a6ce7978aa7fc0e591ae174459277fba5' 
  AND token = 'o8vOemXYFXzWrj7Kjr+1414lRd3EpMTZSgV1Hi/xkLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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