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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0952e84cd45b9a39cf3f1cef4098e72ddb27168445f706f4cfbd7bde3d7e6b' 
  AND token = 'Lj+XpU98me9ioQXSnU5FS6MvZycujvYC2E6Zme1sxy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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