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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec31ae91c0323896ccc6ed250cfef16692900dacddbcdff7b827d6fdf65bf8d' 
  AND token = 'on7t2BOzSiFaM1A1vrfz6ERS3Tl+rkOrcGuB67k/6FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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