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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bd0de995f31586698b00cff3ab6bbb83926cc90371321f0761678c8efe946d' 
  AND token = 'ek/UW/FtP5LZkJygXREj8Vfun2TXdja07qwVXor+6kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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