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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f9286ee4a3433bf2e0de5a8d23684cfd7c588d6605880bbb0bbe0a76c34a96' 
  AND token = 'ro+KRyiwA9Ih2vwAl2NtpAKdbFAxsz1VYsPzJ2ef0pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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