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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e522944493dcd6313420529f04689fe20bdca55d3d335f24d7149f5a84817613' 
  AND token = 'Qpqjzz6D46oNY4NiMG7ojKmT5DxciFe5NowvvHs3R2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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