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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4349850f10cb557c36f9dfa60e4d2838ccfbcf8a42671cb6ce9d71da6179d5d' 
  AND token = 'OY4m64JoY0uu2z3sFfo/ey7okwnBdEy+B3O32ajTrC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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