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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3698ae7b5e198b909ed6ffe5e2de68f0fa615bab037f0286598fa5eaba2de20a' 
  AND token = 'xaBidsKh6qjzm+bhohCkcMVOVh4fRs1jySbTBh+kw3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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