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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096b58ed5caa8ccbd152e70b9e500dee4878390d5ea4630415f63b9b1717409c' 
  AND token = 'RJpe6A9vw5fQAr6209tOuzvQDl40+PpDC2R45Viji9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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