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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3410aefad977252c5ffa49314cfe6182f198cd0b55b93dc276832223e414fa63' 
  AND token = 'LNr+Qc1rAm+QHm+Nylnj+lRxVxCaCMc7OZeT3B94whM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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