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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3dc448ae8ef98850e35bdae55aab134e3e3e46018cce5480b7309c1b3c503f' 
  AND token = 'L7Wst0/ddivndIUKaD5Ivtd5903JDuG2/otw7E6q1Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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