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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9607836aa923cc4b65baf77322fe31cd9f632b7948a2724af9ff029b2e1fb394' 
  AND token = '8GxBOnkn8Wua0ywOBmDr0+pbSOrfFORYti/FHQV23Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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