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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f2d0a37fe5728903ac34a819ee4dce680b6f6e8fedbcdc222041af4a73fcfe' 
  AND token = '+dv1O8Uu+72w+YeMr6f4kM+FqsOvT85pMb5ZFpg0TVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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