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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3879dc78865d690022e86aaf76af7387089b194296a83511edd20c444cf784' 
  AND token = 'sXAfEQfKYazo7Slom3m0S7of8bLzG7b4aytQC0ltstc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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