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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e906829fdb2ae49dfdb9ab4b49ea5b0d7a10f0bb8fb580e87e9c6b2aa303d4e3' 
  AND token = 'AnC8qAhDRQzHkjGawshhs80Yvpol9vwyV3CJcMTCAeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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