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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e62229e9fd08d8a00e7dcca569f61c3f95466602109168144e25e6c157bdfd' 
  AND token = 'YMkBN0SOC8ybpxokRgTQPQdP5xZfMlEbHYL7RaTSm4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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