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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebedc957b53216de4ffc10c14182a1799348cee0e205d7f7262e5b9ba034403' 
  AND token = 'UdMed7L/wuv3vLV1TTM0hz+5xO91XD2MDKBYAJYHStk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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