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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931fe4979d93280ef9d629ca501187f936fcd8829669658037187cc0413c3571' 
  AND token = 'KqRKc5OU9iH74H8xm+fAGZqPd+brI3SRKVWAmCrw3F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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