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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc2c017442d5a13e1e81915dad89e8b240b2dd767a9e515f639a02f0079f26f' 
  AND token = 'QCoB68a15kDib1gewfr3PgcxVmt30QkqSEkGGXE5sj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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