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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ff34de990e84ccdd43fd5fd68efcc96ef9afbf5d43dd66374e1c3aafc02e88' 
  AND token = 'g1fWgxiroE4M1chfIMi//Luck/q/31ihS3ekV/bR1rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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