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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64053b9fd5c3113a360e00de07ec4c4982968dfda11aaa125c22ae3e17a47137' 
  AND token = 'cunBuyXgTvGZo3teLuaO8VifW4E9ksdWrx2+EnB5j/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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