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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5031cef91cd08dfedb6230777f9c9474a1d11ffbc2970dc5483ecb7b57f2a5' 
  AND token = 'uSOW5OOU0UqJ/XtjNNp56hC1YNDuZBfrcU1/9ZkfISw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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