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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e0d852fbd55bfeed886d6ea0e44842a382b92875c77f0e28626fb8b6d5bb61' 
  AND token = 'UsDFMT7LiDlVHtpEPI0XJpKHNIzeFS/9Y+R8JpUlbsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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