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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700df856e029876ebbe523f9001f91abab577fb5a3fff5ee86901f46834d4345' 
  AND token = 'z5T4poZuNxZk7I/Ndd4ebX4/tpSDk5VTvJto23xHmtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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