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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ac4cefef332470fe510ce1c70380c448cc76838a4d74921b47a0336fc2d0ca' 
  AND token = 'FOBjJBlxZGxuw/e4aPxy4B/KqS1XqUQpk+oOfak3nJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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