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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9743e48b510766e89def0b075b955cab6faf3dae9226d9f914a1796203b1754' 
  AND token = 'oKpy56hly/8B282cFNGwSFojp6Br6Hszw/NOf2v/DsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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