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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee46baa8666f4628cc41deb6b30afe5da170c9b67c89221a6f655da1b15e817' 
  AND token = 'g2oarr2QNK5kOaFR2wujggO+78A0bxbDbQp4yBWKtHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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